Hey ladies & gents,
As many of us including me have suffered from unsupported mac's on OCLP accidentally upgrading to Tahoe OS with complete loss of keyboard, mouse, and usb functions I've found a solution to save your data but it will require you to own a computer that does support Tahoe currently. First off you will need 2 External Hard Drives preferably SSD variants for speed. You will need to create a new copy of Sonoma or Sequoia with OCLP on a USB Drive. Attach both external drives & the Mac OS USB Installer to your affected computer. Turn on the computer holding down Option or Alt key depending on the year mac you are running. When the boot options appear select the Mac OS USB Installer you created with OCLP. Once loaded before installing your OS go into Disk Utility and choose 1 of your SSD's to format as AFPS and I recommend naming it Mac OS External to install your secondary OS onto. After that close Disk Utility and begin the install of Sonoma or Sequoia. When you get to the prompt on choosing what disk to install your OS on please make sure you select the external disk you just created with Disk Utility. This now will go through the normal process of installing Sonoma or Sequoia onto your external drive therefor not deleting the data on your internal drive. Once fully installed and setup while on your externally operating OS go into settings and select time machine. This is the point where you are going to use time machine to set your second external drive to be the time machine backup drive. After you have done this manually trigger time machine to start a full backup. It will backup copies of both the internal SSD/HDD OS & external even though you are only operating on Sonoma or Sequoia. It is important that your Time Machine External HDD or SSD has a bit more space on it then your actual internal HDD or SSD. For example I installed Sequoia on my 1TB external SSD and used my 4TB external HDD for my time machine backup drive. Depending on your computers speed it may take several hours. After the time machine backup is complete you can now eject the time machine external HDD or SSD. At this point you will need a newer Mac that is Tahoe compatible to be able to retrieve your old apps, data, messages, etc, etc. Once on the Tahoe Mac you can hook up your external time machine backup drive and open data migration. From there you can recover all your data and choose to setup the new computer as your old system or there are other options. This does suck that you need to have a mac capable of running Tahoe but if you are like me and have data that you could absolutely not loose this was the easiest option. I will also include that the data I recovered was from my 2015 iMac 27" 5K and it was running on its Fusion Drive. If there is any questions please feel free to ask! I hope this helps others as its been about almost 5 weeks now and I've seen no solutions so far to recover data without having to send drives out or other expensive options.
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